* General Public License for more details.
*/
-#define DBG_EVAL 0
#include "ao_lisp.h"
#include <assert.h>
-const struct ao_lisp_type ao_lisp_stack_type;
-
-static int
-stack_size(void *addr)
-{
- (void) addr;
- return sizeof (struct ao_lisp_stack);
-}
-
-static void
-stack_mark(void *addr)
-{
- struct ao_lisp_stack *stack = addr;
- for (;;) {
- ao_lisp_poly_mark(stack->sexprs, 0);
- ao_lisp_poly_mark(stack->values, 0);
- /* no need to mark values_tail */
- ao_lisp_poly_mark(stack->frame, 0);
- ao_lisp_poly_mark(stack->list, 0);
- stack = ao_lisp_poly_stack(stack->prev);
- if (ao_lisp_mark_memory(&ao_lisp_stack_type, stack))
- break;
- }
-}
-
-static void
-stack_move(void *addr)
-{
- struct ao_lisp_stack *stack = addr;
-
- while (stack) {
- struct ao_lisp_stack *prev;
- int ret;
- (void) ao_lisp_poly_move(&stack->sexprs, 0);
- (void) ao_lisp_poly_move(&stack->values, 0);
- (void) ao_lisp_poly_move(&stack->values_tail, 0);
- (void) ao_lisp_poly_move(&stack->frame, 0);
- (void) ao_lisp_poly_move(&stack->list, 0);
- prev = ao_lisp_poly_stack(stack->prev);
- if (!prev)
- break;
- ret = ao_lisp_move_memory(&ao_lisp_stack_type, (void **) &prev);
- if (prev != ao_lisp_poly_stack(stack->prev))
- stack->prev = ao_lisp_stack_poly(prev);
- if (ret)
- break;
- stack = prev;
- }
-}
-
-const struct ao_lisp_type ao_lisp_stack_type = {
- .size = stack_size,
- .mark = stack_mark,
- .move = stack_move,
- .name = "stack"
-};
-
struct ao_lisp_stack *ao_lisp_stack;
ao_poly ao_lisp_v;
-struct ao_lisp_stack *ao_lisp_stack_free_list;
-
ao_poly
ao_lisp_set_cond(struct ao_lisp_cons *c)
{
return AO_LISP_NIL;
}
-static void
-ao_lisp_stack_reset(struct ao_lisp_stack *stack)
-{
- stack->state = eval_sexpr;
- stack->sexprs = AO_LISP_NIL;
- stack->values = AO_LISP_NIL;
- stack->values_tail = AO_LISP_NIL;
-}
-
-
-static int
-ao_lisp_stack_push(void)
-{
- struct ao_lisp_stack *stack;
- if (ao_lisp_stack_free_list) {
- stack = ao_lisp_stack_free_list;
- ao_lisp_stack_free_list = ao_lisp_poly_stack(stack->prev);
- } else {
- stack = ao_lisp_alloc(sizeof (struct ao_lisp_stack));
- if (!stack)
- return 0;
- }
- stack->prev = ao_lisp_stack_poly(ao_lisp_stack);
- stack->frame = ao_lisp_frame_poly(ao_lisp_frame_current);
- stack->list = AO_LISP_NIL;
- ao_lisp_stack = stack;
- ao_lisp_stack_reset(stack);
- DBGI("stack push\n");
- DBG_FRAMES();
- DBG_IN();
- return 1;
-}
-
-static void
-ao_lisp_stack_pop(void)
-{
- ao_poly prev;
-
- if (!ao_lisp_stack)
- return;
- prev = ao_lisp_stack->prev;
- ao_lisp_stack->prev = ao_lisp_stack_poly(ao_lisp_stack_free_list);
- ao_lisp_stack_free_list = ao_lisp_stack;
-
- ao_lisp_stack = ao_lisp_poly_stack(prev);
- if (ao_lisp_stack)
- ao_lisp_frame_current = ao_lisp_poly_frame(ao_lisp_stack->frame);
- else
- ao_lisp_frame_current = NULL;
- DBG_OUT();
- DBGI("stack pop\n");
- DBG_FRAMES();
-}
-
-static void
-ao_lisp_stack_clear(void)
-{
- ao_lisp_stack = NULL;
- ao_lisp_frame_current = NULL;
- ao_lisp_v = AO_LISP_NIL;
-}
-
static int
func_type(ao_poly func)
{
return ao_lisp_poly_builtin(func)->args & AO_LISP_FUNC_MASK;
case AO_LISP_LAMBDA:
return ao_lisp_poly_lambda(func)->args;
+ case AO_LISP_STACK:
+ return AO_LISP_FUNC_LAMBDA;
default:
ao_lisp_error(AO_LISP_INVALID, "not a func");
return -1;
break;
case AO_LISP_FUNC_MACRO:
/* Evaluate the result once more */
- ao_lisp_stack->state = eval_sexpr;
+ ao_lisp_stack->state = eval_macro;
if (!ao_lisp_stack_push())
return 0;
* value and re-evaluate it
*/
prev = ao_lisp_poly_stack(ao_lisp_stack->prev);
- ao_lisp_stack->state = eval_sexpr;
ao_lisp_stack->sexprs = prev->sexprs;
- prev->sexprs = AO_LISP_NIL;
DBGI(".. start macro\n");
DBGI(".. sexprs "); DBG_POLY(ao_lisp_stack->sexprs); DBG("\n");
DBGI("set "); DBG_POLY(atom); DBG(" = "); DBG_POLY(val); DBG("\n");
});
builtin = ao_lisp_poly_builtin(ao_lisp_v);
- if (builtin->args & AO_LISP_FUNC_FREE_ARGS)
+ if (builtin->args & AO_LISP_FUNC_FREE_ARGS && !ao_lisp_stack_marked(ao_lisp_stack))
ao_lisp_cons_free(ao_lisp_poly_cons(ao_lisp_stack->values));
ao_lisp_v = v;
+ ao_lisp_stack->values = AO_LISP_NIL;
+ ao_lisp_stack->values_tail = AO_LISP_NIL;
DBGI(".. result "); DBG_POLY(ao_lisp_v); DBG ("\n");
DBGI(".. frame "); DBG_POLY(ao_lisp_frame_poly(ao_lisp_frame_current)); DBG("\n");
break;
case AO_LISP_LAMBDA:
- ao_lisp_stack->state = eval_sexpr;
DBGI(".. frame "); DBG_POLY(ao_lisp_frame_poly(ao_lisp_frame_current)); DBG("\n");
- ao_lisp_v = ao_lisp_lambda_eval();
- DBGI(".. sexpr "); DBG_POLY(ao_lisp_v); DBG("\n");
+ ao_lisp_stack->state = eval_progn;
+ v = ao_lisp_lambda_eval();
+ ao_lisp_stack->sexprs = v;
+ ao_lisp_stack->values = AO_LISP_NIL;
+ ao_lisp_stack->values_tail = AO_LISP_NIL;
+ DBGI(".. sexprs "); DBG_POLY(ao_lisp_stack->sexprs); DBG("\n");
+ DBGI(".. frame "); DBG_POLY(ao_lisp_frame_poly(ao_lisp_frame_current)); DBG("\n");
+ break;
+ case AO_LISP_STACK:
+ DBGI(".. stack "); DBG_POLY(ao_lisp_v); DBG("\n");
+ ao_lisp_v = ao_lisp_stack_eval();
+ DBGI(".. value "); DBG_POLY(ao_lisp_v); DBG("\n");
DBGI(".. frame "); DBG_POLY(ao_lisp_frame_poly(ao_lisp_frame_current)); DBG("\n");
break;
}
- ao_lisp_stack->values = AO_LISP_NIL;
- ao_lisp_stack->values_tail = AO_LISP_NIL;
return 1;
}
ao_lisp_stack->state = eval_cond_test;
if (!ao_lisp_stack_push())
return 0;
- ao_lisp_stack->state = eval_sexpr;
}
return 1;
}
DBGI(".. saved frame "); DBG_POLY(ao_lisp_stack->frame); DBG("\n");
if (ao_lisp_v) {
struct ao_lisp_cons *car = ao_lisp_poly_cons(ao_lisp_poly_cons(ao_lisp_stack->sexprs)->car);
- struct ao_lisp_cons *c = ao_lisp_poly_cons(car->cdr);
+ ao_poly c = car->cdr;
if (c) {
- ao_lisp_stack->state = eval_sexpr;
- ao_lisp_v = c->car;
+ ao_lisp_stack->state = eval_progn;
+ ao_lisp_stack->sexprs = c;
} else
ao_lisp_stack->state = eval_val;
} else {
} else {
ao_lisp_v = ao_lisp_poly_cons(ao_lisp_stack->sexprs)->car;
ao_lisp_stack->sexprs = ao_lisp_poly_cons(ao_lisp_stack->sexprs)->cdr;
+
+ /* If there are more sexprs to do, then come back here, otherwise
+ * return the value of the last one by just landing in eval_sexpr
+ */
if (ao_lisp_stack->sexprs) {
ao_lisp_stack->state = eval_progn;
if (!ao_lisp_stack_push())
DBGI(".. frame "); DBG_POLY(ao_lisp_frame_poly(ao_lisp_frame_current)); DBG("\n");
DBGI(".. saved frame "); DBG_POLY(ao_lisp_stack->frame); DBG("\n");
+ ao_lisp_stack->values = ao_lisp_v;
if (!ao_lisp_stack->sexprs) {
ao_lisp_v = AO_LISP_NIL;
ao_lisp_stack->state = eval_val;
ao_lisp_stack->state = eval_while_test;
if (!ao_lisp_stack_push())
return 0;
- ao_lisp_stack->state = eval_sexpr;
}
return 1;
}
DBGI(".. saved frame "); DBG_POLY(ao_lisp_stack->frame); DBG("\n");
if (ao_lisp_v) {
+ ao_lisp_stack->values = ao_lisp_v;
ao_lisp_v = ao_lisp_poly_cons(ao_lisp_stack->sexprs)->cdr;
- if (ao_lisp_v)
- ao_lisp_v = ao_lisp_poly_cons(ao_lisp_v)->car;
ao_lisp_stack->state = eval_while;
if (!ao_lisp_stack_push())
return 0;
+ ao_lisp_stack->state = eval_progn;
+ ao_lisp_stack->sexprs = ao_lisp_v;
}
else
+ {
ao_lisp_stack->state = eval_val;
+ ao_lisp_v = ao_lisp_stack->values;
+ }
+ return 1;
+}
+
+/*
+ * Replace the original sexpr with the macro expansion, then
+ * execute that
+ */
+static int
+ao_lisp_eval_macro(void)
+{
+ DBGI("macro: "); DBG_POLY(ao_lisp_v); DBG(" sexprs "); DBG_POLY(ao_lisp_stack->sexprs); DBG("\n");
+
+ if (ao_lisp_v == AO_LISP_NIL)
+ ao_lisp_abort();
+ if (ao_lisp_poly_type(ao_lisp_v) == AO_LISP_CONS) {
+ *ao_lisp_poly_cons(ao_lisp_stack->sexprs) = *ao_lisp_poly_cons(ao_lisp_v);
+ ao_lisp_v = ao_lisp_stack->sexprs;
+ DBGI("sexprs rewritten to: "); DBG_POLY(ao_lisp_v); DBG("\n");
+ }
+ ao_lisp_stack->sexprs = AO_LISP_NIL;
+ ao_lisp_stack->state = eval_sexpr;
return 1;
}
[eval_progn] = ao_lisp_eval_progn,
[eval_while] = ao_lisp_eval_while,
[eval_while_test] = ao_lisp_eval_while_test,
+ [eval_macro] = ao_lisp_eval_macro,
+};
+
+const char *ao_lisp_state_names[] = {
+ "sexpr",
+ "val",
+ "formal",
+ "exec",
+ "cond",
+ "cond_test",
+ "progn",
};
/*
projects / fw / altos / blobdiff